ci: copy ui-svelte/.npmrc before npm ci in fork-cuda build

npm ci ran without .npmrc (legacy-peer-deps=true), failing on the
tailwind/vite peer dependency conflict. Copy .npmrc with the manifest.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

docker/fork-cuda.Containerfile

@@ -16,8 +16,10 @@ ARG BASE_TAG=server-cuda-b9821
 # ---- Stage 1: build the Svelte UI (embedded into the binary) ----
 FROM node:22-bookworm-slim AS ui
 WORKDIR /src/ui-svelte
-# Install deps first for layer caching.
-COPY ui-svelte/package.json ui-svelte/package-lock.json ./
+# Install deps first for layer caching. .npmrc carries legacy-peer-deps=true,
+# which the project relies on (tailwind/vite peer ranges), so copy it before
+# npm ci or the strict resolver fails with ERESOLVE.
+COPY ui-svelte/package.json ui-svelte/package-lock.json ui-svelte/.npmrc ./
 RUN npm ci
 COPY ui-svelte/ ./
 # `npm run build` is `vite build --emptyOutDir`; vite.config.ts writes to